Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Aisan Kogyo Kabushiki Kaisha

Nippon Soken, Inc.

Kabushiki Kaisha Tokai Rika Denki Seisakusho

Yuusaku Nishimura

Keita Fukui

Masao Kano

Noriyasu Amano

Shinsuke Takakura

Tatsuhiko Akita

Shinsuke Kiyomiya

Yoshikazu Miyabe

Minoru Akita

Naoyuki Tagawa

Hideki Miyahara

Tomoaki Nakano

Ryuji Kosugi

Shinji Shimokawa

Noriyuki Suzuki

Masahide Kobayashi

Etsuo Shimizu

Yoshiyuki Seki

Tsuneyuki Kurata

Masamitsu Hayakawa

Norihisa Yamamoto

Hidetoshi Tsutsumi

Teruhisa Matsushita

Sinsuke Kiyomiya

Toshiki Nogami

Tatsuya Michihiro

A leak diagnosis device for a fuel vapor treatment apparatus, comprising: a first diagnosis unit that performs a leak diagnosis of a fuel tank based on a tank internal pressure in a closed state of a sealing valve; a determination unit that opens a sealing valve in a state where a purge valve and a switching valve are closed when the tank internal pressure is within a normal range, and determines whether there is an influence on the valve openability of the switching valve; and a second diagnosis unit that performs a leak diagnosis of the canister based on the tank internal pressure or the canister internal pressure when the determination unit makes a negative determination, and performs a leak diagnosis of the canister based on the canister internal pressure after closing the closed valve when the determination unit makes an affirmative determination.

Leak diagnosis device of fuel vapor treatment apparatus

The fuel vapor treatment apparatus includes a fuel tank, a canister, a vapor passage, a purge passage, a sealing valve, a purge valve, an outside air introduction passage, a switching valve, and a differential pressure detector. A processing device of the fuel vapor treatment apparatus includes a purge control unit and a purge diagnosis unit. The purge control unit performs a purge process by opening the purge valve in a state where the purge valve and the sealing valve are closed and the switching valve is opened. The purge diagnosis unit diagnoses whether or not the purge process is normal based on the amount of change in the differential pressure between before and after the opening of the purge valve.

Control device for fuel vapor treatment apparatus

An intake pipe of an evaporated fuel processing device is provided with a throttle valve downstream of a supercharger, and an ejector in parallel to the supercharger. A purge passage is branched into first and second branch passages, which connect to the intake pipe at a position downstream of the throttle valve and to a suction port of the ejector, respectively. In the ejector, its intake port is connected to the intake pipe at a position between the supercharger and the throttle valve, and its exhaust port is connected to the intake pipe at a position upstream of the supercharger. A flow rate of purge gas in the second branch passage is obtained based on at least two of a first pressure downstream of the throttle valve, a second pressure between the supercharger and the throttle valve, and a third pressure upstream of the supercharger.

Evaporated fuel processing device

A fuel vapor processing apparatus includes an adsorbent canister, a vapor path connecting the adsorbent canister to a fuel tank, and a flow control valve disposed in the vapor path. The flow control valve is kept closed while a movement distance of a valve body from a predetermined initial position toward a valve opening direction is less than a predetermined distance. A control unit comprising part of the apparatus is configured to set a valve opening speed of the flow control valve to a first speed under a condition where the movement distance of the valve body is less than the predetermined distance, and to set the valve opening speed of the flow control valve to a second speed lower than the first speed under a condition where the movement distance of the valve body is greater than the predetermined distance.

Fuel vapor processing apparatus

A fuel vapor processing apparatus includes a vapor path connecting an adsorbent canister to a tank, where a valve is disposed in the vapor path and comprises a body and a seat, and a control unit configured to detect a movement distance of the body from the seat as a valve movement distance at a valve opening start position. This position results when a change in inner pressure of the tank after starting movement of the body toward a valve opening direction becomes greater in magnitude than a predetermined amount, wherein the control unit stores the valve movement distance in the valve opening direction as a learning value, and also stores one of two predetermined restriction values as the learning value instead of the valve movement distance when the valve movement distance is not within a range between a previously stored learning value and one of the restriction values.

A processor may perform a purging process, which may introduce fuel vapor adsorbed by a canister into an intake passage. The processor may identify clogging of a purge passage based on a decrease amount of the pressure in the canister that results from execution of the purging process. The processor may open an isolation valve when the pressure in a fuel tank is less than or equal to a first pressure, which is less than an atmospheric pressure, and close the isolation valve when the pressure in the fuel tank is greater than or equal to a second pressure, which is greater than the first pressure and less than the atmospheric pressure. The processor may disable the purging process at least in a period from when the processor closes the isolation valve to when a prescribed time has elapsed from the closing of the isolation valve.

Fuel vapor treatment system

A liquid submerged portion fuel leakage diagnostic apparatus includes a tank internal pressure detection portion; a liquid level detection portion; a reference-state liquid level extraction portion configured to extract, as a reference-state liquid level, a liquid level detected by the liquid level detection portion, when a tank internal pressure detected by the tank internal pressure detection portion becomes equal to a reference internal pressure; a fuel consumption detection portion configured to detect consumption of fuel in a fuel tank; and a fuel leakage diagnostic portion configured such that if the fuel consumption is not detected by the fuel consumption detection portion during a period between extraction timings at which the reference-state liquid levels are extracted by the reference-state liquid level extraction portion, the fuel leakage diagnostic portion diagnoses presence or absence of fuel leakage from a liquid submerged portion based on comparison of the reference-state liquid levels.

Liquid submerged portion fuel leakage diagnostic apparatus

A fuel vapor processing apparatus may include a case defining therein a first adsorption chamber, a second adsorption chamber and a non-adsorption chamber communicating between the first adsorption chamber and the second adsorption chamber. The cross sectional flow area of the first adsorption chamber may be smaller than the cross sectional flow area of the second adsorption chamber.

An evaporative fuel treatment system is disclosed that includes a canister, a detection passage having a reduced area portion, and switching device that switches fluid communication. Also included is a depressurizing device for depressurizing the detection passage coupled to the detection passage on a side of the reduced area portion opposite to the switching device, and a pressure detecting device. Moreover, the system includes an evaporative fuel state calculating device for calculating an evaporative fuel state in the mixture based on a cutoff pressure, an air pressure, and a mixture pressure of a mixture of air and the evaporative fuel. In one embodiment, the cutoff pressure, the air pressure, and the mixture pressure are detected independently and discontinuously. In another embodiment, the cutoff pressure and the air pressure are detected on a continual basis during purge of the evaporative fuel.

Evaporative fuel treatment system

A fuel vapor treatment apparatus includes a first canister, a purge passage, an atmosphere passage, a first detection passage provided with a restrictor, and a passage-changing valve for changing the connection passage of the first detection passage between the purge passage and the atmosphere passage. The apparatus further includes a second canister connecting with the first detection passage on the opposite side of the passage-changing valve across the restrictor. A differential pressure sensor detects a pressure difference between both ends of the restrictor. An ECU computes the concentration of fuel vapor on the basis of the detection result of the differential pressure sensor.

Fuel vapor treatment apparatus

A fuel vapor processing apparatus includes a canister, a purge passage, a detection passage including an atmosphere passage and a restrictor, a passage changing valve for changing the connection passage of the detection passage between the purge passage and the atmosphere passage, a pump connecting with the detection passage on the opposite side of the passage changing valve across the restrictor, a pressure sensor for detecting a pressure between the restrictor and the pump, and an ECU for computing the concentration of fuel vapor. When the passage changing valve causes the purge passage to connect with the detection passage and the pump reduces pressure in the detection passage to pass the air-fuel mixture through the restrictor, the pressure sensor detects the pressure during a detection period of time that elapses after the air-fuel mixture passes through the restrictor until the air-fuel mixture reaches the pump.

When a gas flow producer is driven, plural kinds of gases flow into a measure-passage at respective timing. An orifice is provided in the measure-passage. The orifice has a diameter-changing portion which restricts a separation of gases from an inner surface of the measure-passage. A pressure sensor is provided in the measure-passage to detect a pressure determined by the orifice and the gas flow producer. A microcomputer calculates a density ratio between the gases based on the detected differential pressure.

Gas density ratio detector, gas concentration detector, and fuel vapor treatment apparatus

A 2-L slider supported by a shaft so as to be slidable in a predetermined range substantially in a vehicle transverse direction that, when pressed by a shift lever which is being a select-operated to an &ldquo;L&rdquo; position, slides toward a detent wall against an urging force of a compression coil spring. At this time, a cam portion provided at the 2-L slider presses a press receiving block provided at a shift lock plate downward. Thus, a slider which slides with the shift lock plate moves downward. A position detecting mechanism detects that the slider has moved downward. The position detecting mechanism is not a mechanism specially provided for detecting select operation to the &ldquo;L&rdquo; position, but a mechanism for detecting whether or not the shift lever is positioned at a &ldquo;P&rdquo; position. Therefore, costs can be kept down.

Growing community of inventors

Toyota, Japan

Yuusaku Nishimura